TEXTURE AND STRUCTURE OF SOILS 



33 



sSOIL-, MO. 1 



FINE COARSE 



6 RAVEL 5AN0 



FINE 

 SAND 



VERY FINE 

 SAND 



CLAY 



FINE COARSE. MEDIUM 

 GBAVEL SAND S/4ND 



FINE. 

 5AM D 



VERY FINE 

 SAND 5ILT CLAY 



Fig. 3. — Graphic statement of mechanical analyses of two soils. No. 1 

 is a very sandy soil, and it will be noted that the bulk of its particles consist 

 of medium and fine sand. No. 2 is a heavy clay and its particles belong 

 mainly to the silt and clay divisions. 



33. Soil class. — The terms " sandy soil," "loam soil," 

 " clay soil " and the like have been in such general use and are 

 so convenient that attempts have been made to devise a sys- 

 tematic classification on this basis. A soil class is made 



